inheritance without extended info

Helge Waastad

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Aug 11, 2016, 2:26:37 PM8/11/16

to Ebean ORM

Hi,

playing around with ebean and inheritance:

If I extend a class without adding more fields to subclass, querybean enhancement fails:

ex:

@Entity

@Inheritance(strategy = InheritanceType.SINGLE_TABLE)

@DiscriminatorValue(value = "ParentGroup")

public class Parent extends BaseModel {

private String name;

}

and

@Entity

@DiscriminatorValue(value = "ChildGroup")

public class Child extends Parent {

}

output:

java.lang.NullPointerException

at org.avaje.ebean.typequery.agent.TypeQueryAddMethods.add(TypeQueryAddMethods.java:20)

at org.avaje.ebean.typequery.agent.TypeQueryClassAdapter.visitEnd(TypeQueryClassAdapter.java:141)

at org.avaje.ebean.typequery.agent.asm.ClassReader.accept(ClassReader.java:697)

at org.avaje.ebean.typequery.agent.asm.ClassReader.accept(ClassReader.java:506)

at org.avaje.ebean.typequery.agent.QueryBeanTransformer.enhancement(QueryBeanTransformer.java:104)

at org.avaje.ebean.typequery.agent.QueryBeanTransformer.transform(QueryBeanTransformer.java:78)

at org.avaje.ebean.typequery.agent.offline.InputStreamTransform.transform(InputStreamTransform.java:57)

at org.avaje.ebean.typequery.agent.offline.InputStreamTransform.transform(InputStreamTransform.java:41)

at org.avaje.ebean.typequery.agent.offline.OfflineFileTransform.transformFile(OfflineFileTransform.java:136)

at org.avaje.ebean.typequery.agent.offline.OfflineFileTransform.processPackage(OfflineFileTransform.java:119)

at org.avaje.ebean.typequery.agent.offline.OfflineFileTransform.processPackage(OfflineFileTransform.java:110)

at org.avaje.ebean.typequery.agent.offline.OfflineFileTransform.process(OfflineFileTransform.java:64)

at org.avaje.ebean.typequery.maven.MavenEnhanceTask.execute(MavenEnhanceTask.java:83)

at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)

at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)

at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)

at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)

at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)

at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)

at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)

at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)

at org.apache.maven.cli.MavenCli.execute(MavenCli.java:862)

at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:286)

at org.apache.maven.cli.MavenCli.main(MavenCli.java:197)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)

at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)

at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)

at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)

For single empty beans it's OK:

@Entity

public class EmptyBean extends BaseModel {

}

br hw

Rob Bygrave

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Aug 23, 2016, 5:03:50 AM8/23/16

to ebean@googlegroups

Logged as https://github.com/ebean-orm/querybean-agent/issues/10

Fixed in 8.1.3 of the agent (and associated maven plugin)

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Helge Waastad

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Aug 23, 2016, 8:21:49 AM8/23/16

to Ebean ORM

Hi,

thx for a quick fix :-)

/hw

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Rob Bygrave

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Aug 23, 2016, 5:45:48 PM8/23/16

to ebean@googlegroups

No problem. Thanks for taking the time to raise the issue.

With these types of issues it is really good to raise them as you have done. Sometimes as busy developers we tend to just work around the issue and move on without raising / logging the issue. All these small issues can add up so for me I think it is really good to see issues like this raised and fixed.

Cheers, Rob.

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